Problem Library

Master these coding challenges to ace your next technical interview. Handpicked problems with personalized spaced repetition.

All tracks Blind 75 NeetCode 150 NeetCode 250 Striver A to Z SDE Sheet

Showing 76-100 of 250 matching problems.

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All topics Algorithm X Array Backtracking Bidirectional Search Binary Indexed Tree Binary Lifting Binary Search Binary Search Tree Binary Tree Bit Manipulation Boyer–Moore Majority Vote Algorithm Boyer–Moore String-Search Algorithm Bracket Sequences Breadth-First Search Brute-Force Search Bubble Sort Bucket Sort Combinatorics

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Title	Difficulty	Topics
76. Minimum Window Substring Open source	Hard	Hash TableStringSliding Window
77. Combinations Open source	Medium	Backtracking
78. Subsets Open source	Medium	ArrayBacktrackingBit Manipulation
79. Word Search Open source	Medium	ArrayStringBacktracking+2 more
80. Remove Duplicates from Sorted Array II Open source	Medium	ArrayTwo Pointers
81. Search in Rotated Sorted Array II Open source	Medium	ArrayBinary Search
82. Remove Duplicates from Sorted List II Open source	Medium	Linked ListTwo Pointers
83. Remove Duplicates from Sorted List Open source	Easy	Linked List
84. Largest Rectangle in Histogram Open source	Hard	ArrayStackMonotonic Stack+1 more
85. Maximal Rectangle Open source	Hard	ArrayDynamic ProgrammingStack+2 more
86. Partition List Open source	Medium	Linked ListTwo Pointers
87. Scramble String Open source	Hard	StringDynamic Programming
88. Merge Sorted Array Open source	Easy	ArrayTwo PointersSorting
89. Gray Code Open source	Medium	MathBacktrackingBit Manipulation
90. Subsets II Open source	Medium	ArrayBacktrackingBit Manipulation
91. Decode Ways Open source	Medium	StringDynamic Programming
92. Reverse Linked List II Open source	Medium	Linked List
93. Restore IP Addresses Open source	Medium	StringBacktracking
94. Binary Tree Inorder Traversal Open source	Easy	StackTreeDepth-First Search+1 more
95. Unique Binary Search Trees II Open source	Medium	Dynamic ProgrammingBacktrackingTree+2 more
96. Unique Binary Search Trees Open source	Medium	MathDynamic ProgrammingTree+2 more
97. Interleaving String Open source	Medium	StringDynamic Programming
98. Validate Binary Search Tree Open source	Medium	TreeDepth-First SearchBinary Search Tree+1 more
99. Recover Binary Search Tree Open source	Medium	TreeDepth-First SearchBinary Search Tree+1 more
100. Same Tree Open source	Easy	TreeDepth-First SearchBreadth-First Search+1 more